Process for mounting glass pulls



Oct. 27, 1942. M. c. KOESTER PROCESS OR MOUNTING GLASS PULLS Filed Aug. 9, 1959 2 SheetS-Sheet l l. wg, z, /5

Ementor i MELv/N CZ KOETEI?.

ttorneg .Oct. 27, 1942. o s E V 2,299,827

I PROCESS FOR MOUNTINGIGLASS POLLS Filed Au 9, 1939 2 Sheets-Shet 2 I Z@ /l v Znventor MELv/N Ci KOESTER.

Patented Oct. 27,' 1942 i UNITED STATE s PATENT OFFICE 2 Claims. (Cl. is-813 The present invention relates to an improved method of` mounting glass pulls on glassdoors,

windows, partitions, and the like.

In limousines, taxicabs, and airplanes, where sliding glass windows or partitions are used, as well as in showcases, re'igerators, and the like, where sliding glass doors are employed, it is desirable that glass pulls be applied to the doors, windows, or partitions to facilitate the sliding movement thereof. Heretoiore, it has been proposed to apply these glass pulls by means of a suitable adhesive or cement, but this methodhas not been particularly satisfactory for' various reasons, among which may be mentioned the tendency of the pulls to eventually become detached !rom the glass, the squeezing out of the adhesive or cement around the edges of the pulls and the eventual discoloration of the adhesive or cement resulting in an unsightly appearance. w

"Itjis the aim of this invention to provide a process tor mounting glass pulls upon glass doors, windows, or partitions in a manner to provide a permanent bond between the pulls and glass as well as one which will remain transparent so as not to mar the appearance or the door, window, or partition. Although the process of this inventlon is particularly applicable and is herein illustrated and described in the` mounting of` glass pulls upon sheets of laminated safety glass, it is to be understood that the process is equally applicable in the mounting of glass pulls upon single sheets or plates of glass.

Otherobjects and advantages oi .the invention will become more apparent during the course of the following description when taken in connection with the accompanying drawings.

In the drawings wherein like numerals are employed to designate like parts throughout the same:

Fig. 1 is a diagrammatic transverse sections. view through a limousine or taxicab provided with a sliding partition between the driver and the occupants ofthe vehicle, showing one application of the invention;

Fig. 2 is a transverse sectional view showing i the assembling of two sheets oi glass with\an interposed layer of plastic material in' the makl ing ot laminated safety class; l

Fig. 3 is a vertical longitudinal sectional view through apparatus !or subjecting the siass-` plastic laminations to a preliminary pressing Fig. 4 is a sectional view showing the application o! the glass pulls to opposite faces of a Fig. 5 is aperspective View of one of the glass p s;

Fig. 6 is an elevation, partially in section, ot an autoclave in which the laminated glass sandwiches may be subjected to final heat and pressure treatment" and the glass pulls simultaneously secured thereto; and e Fig. 7 is a sectional. View showing a finished sheet of 'laminated glass provided with glass pulls.

With reference to the drawings, there is illustrated diag'rammatically in Fig. 1 a portion of a limousine or taxicab o provided behind the driver's seat with a partition comprising the two glass panels ll and !2. The glass panel il is preferably mounted in a fixed position while the panel 12 is mounted for horizontal sliding movement so that it may be opened to permit conversation between the driver and theoccupants of the rear seat of the vehicle or for any other purpose. In order to facilitate the opening and closing of the panel l2', it is provided upon opposite surfaces and at the outer end thereot i ample, polyvinyl acetal resins. These resins are characterized by increased toughness and greater resistance to discoloration by light.

After the glass sheets ll and !5 and interposed layer IS of plastic material have 'been properly assembled. with one another, as shown in Fig. 2. to provide a Sandwich, the said Sandwich 'is adapted to .be subjected to a preliminary pressi ing operation to expel any air, non-condensable gases, etc. from between the laminations and to cause them to stick` together to prevent the pressing fluid from creeping in between the lami- `nations when the Sandwich is placed in an autoclave where it is subjected to final pressure. This preliminary pressing treatment can be accomplished by passing the Sandwich ll (Fle. 3) through a heating chamber a upon a series of horizontally aligned rolls s. The chamber ll is heated in' any desired manner such as by means of electric heating elements 20. After the sandwich has been properly heated within chamber I! to cause the desired softening of the plastic interlayer, the Sandwich is passed from said e the Sandwich so as to efiect a uniform application of heat and pressure from all sides thereof whereby to cause a .bonding together of the several laminations to produce a composite structure. In such process, it has been found desirable that the Sandwich, before being placed with in the fluid bath, be subjected at least to a relativcly light initial or preliminary pressing suflicient to cause the laminations to stick together in such a manner that the sandwch can be satisfactorily handled and treated in the autoclave.

After the Sandwich ll has been subjected to the prelimnary pressure treatment above described, the glass pulls 23 and 24 (Fig. 4) are adapted to be applied to the outer surfaces of the glass sheets l4 and |5 respectively. These glass pulls consist of small pieces of glass, one of which is shown in F'g5, andthey may be of any desired shape, size and thickness. The pieces of glass forming the pulls 23 and 24 are secured to the glass sheets !4 and |5 by the in- 'terposed layers of plastic material 25 and 26 respeotively. The plastic layers 25 and 26 are also preferably of a synthetic resin material such as polyvinyl acetal resins. In fact, these layers of plastic may be and preferably are of the same material as the material constitutng the plastic interlayer IS.

by passing said Sandwich through a heating oven V or leer. While the glass sheets may be locally heated where the pulls are to be attached, it is preferred that the entire sheets be heated to avoid the setting up of strains in the glass. After the Sandwich has been properly heated, the layers 25 and 26 of plastic material are laid upon the glass sheets !4 and I 5 and the'glass pulls 23 and 24 positioned thereon. It has been found that the amount of pressure which may be exerted upon the pulls by the operator with his fingers is sufiicient to effect a preliminary bondi ing of the pulls to' theglass sheets. 'In other words, the glass pulls are subjected to a preliminary pressing by the operator in much the same manner that the laminated glass Sandwich H is subjected to a preliminary pressing by passing it through the apparatus illustrated in Fig. 3. As will be seen in'Fig. 4, the plastic layers 25 and. 25 are inltially slightly larger than the glass pulls 23 and 24 and after-the pulls have been `attached to the glass sheets by the operator, the plastic projecting beyond the edges of the pulls is trimmed off.

After the glass pulls have been applied to the glasssheets, the Sandwich l'l is adapted to be subjected to final heat and pressure treatment to efl'eot the bonding of the glass sheets H and !i and plastic interlayer IS together. simultaneously, the glass pulls are adapted to b e.firm-.

ly and permanently bonded to the glass sheets. This may be accomplished by placizg one or a plurality of the `sandwiches IT with the glass pulls 23 and 24 attached thereto in an plastic layer s together and the glass pulls 23= and 24 to the glass sheets !4 and !5 through the interposed layers of plastic material 25 and 26.

In Fig. 7 is illustrated a finished laminated safety glass panel having glass pulls attached to opposite sides thereof. Glass panels of this character may be used in any place where it is desired to employ a sliding window, door, partition, or the like, and, in addition to being useful in limousines, taxicabs, and alrplanes, may be employed in showcases or refrigerators or on furniture. By using layers of plastic material for securing the glass'pulls to the glass sheets and by simultaneously uniting the glass sheets !4 and |5 with the plastic interlayer !6 and the glass pulls 23 an 24 with the glass sheets ll and l5 in an autoclave, it will be apparent that a permanent bond will be obtained -between the glass pulls and glass sheets. As a matter of fact, the glass pulls will be secured to the glass sheets just as firmly as the glass sheets themselves are bonded together by the plastic interlayer, !6 so that all danger of the pulls becoming loose cr detached from the glass is obviated. By using a plastic material which is resistant to discoloration by light, the layers of plastic 25 and 26 will remain permanently transparent so as not to mar the appearance o! the laminated glass panel.

I claim:

1. The process oi' mounting glass pulls upon sheets of laminated safety glass, comprising assembling two sheets of glass and an interposed layer of plastic material to form a. sandwich, subjecting said sandwich to a preliminary pressing to secure Initial adhesion between the glass sheets andplastic interlayer, applying a layer of transparent synthetic resin material to one of the glass sheets, laying a glass pull of relatlvely smaller area than the Sandwich upon said layer of s'ynthetic resin material and applying sufllcient pressure thereto to cause it-to adhere to the glass sheet, and then subjecting the lami and glass pull thereon to fect the simultaneous bonding of the glass sheets autoclave '7 glass sheet.

2. The process: of mounting glass pulls upon sheets of lamlnated safety glass, comprsng assembling tw sh'eets of glass and an interposed layer gi-::a vinyl acetal resin material to form a san-dwih, subjecting said Sandwich to a preliminary pressing to secure Initial adhesion between the smaller area than the Sandwich upon said layer of vinyl acetal resin and applying suflicient pressure theretg. ;to' cause it to adhere to the glass sheet, and-then subjecting the laminated glass "Sandwich and glass pull thereon to the direct action of a heated fluid under pressure to efl'ect -thesi rultaneous bonding of the glass sheets to the platie interlayer and the glass pull to the glass sheet.

MELVIN C. KOES'I'ER.

fluid under pressure to etglass sheets and plastic interlayer, applying 

